Unified Frequency Adaptive Filter for Both Single- and Three-Phase Utilization with Multi-Complex Resonators

To fast extract zero-steady-state error of fundamental frequency positive sequence, this paper proposes a unified frequency adaptive filter for single and three phase with multi complex resonators. The structure and principle of this filter are illustrated. The property of proposed filter is analyzed. Simulation results are provided to verify the effectiveness.

I. Introduction

With the rapid development of renewable power generation, power electronic equipment has been widely used in power grid. The characteristic of converters brings great challenges to the safe and stability of power electronic dominated power system. The oscillation frequency distribution caused by power electronic equipment is very wide. The frequency range can be from a few Hz to several hundred Hz. Meanwhile the oscillation frequency is not fixed and has a wide range of variation [1]–[3].